Dietary Isoflavones May Protect against Prostate Cancer in Japanese Men , - Yoshie Nagata; Tomoko Sonoda; Mitsuru Mori; Naoto Miyanaga; Koji Okumura; Ken Goto; Seiji Naito; Kiyohide Fujimoto; Yoshihiko Hirao; Atsushi Takahashi; Taiji Tsukamoto; Hideyuki Akaza (2007)